What is "tocks"

Usage examples of "tocks".

The ticks were all facing away from the portal and its keyhole, but tocks might face toward it.

Army Corps of Engineers, with a plan to build a dam at Tocks Island, very near where I was walking now.

Without them, the clocks had nothing but tocks and were useless, but with them they proceeded in a steady line of tick-tocks and kept good time.